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| Number | Title | Issue Date |
| 6600583 | Optical internet router An optical internet router apparatus uses optical tags to send and receive command and response messages between routers of an optical network for establishing, maintaining or changing a packet data connection over the network between a source router and ... | 07/29/2003 |
| 6577445 | Composite birefringent crystal and filter A stack of two or more birefringent crystals having complimentary properties is arranged to have zero net beam walk-off at off-normal incidence and a finite free-spectral range. In another embodiment, the birefringent crystal materials are selected to pro... | 06/10/2003 |
| 6574396 | Waveguide grating arrangement using a segmented reflector A wavelength slicer uses a waveguide grating router having a periodic arrangement of reflectors in the output circular boundary of the router, which causes each input signal to pass twice through the router. The slicer includes two interleaved sets of equ... | 06/03/2003 |
| 6567195 | Optical network using remote optical powering of optoelectronic switch An optical local area network uses modified remote network interface cards (NICs) to provide an optical carrier signal for signaling use by a centralized optoelectronic switch unit. The NIC optical transceiver is modified so that instead of being normally... | 05/20/2003 |
| 6549313 | Broadbrand electronic N×N cross-connect switch using tunable lasers A programmable broadband N×N cross-connect switch includes an N×N wavelength coupler combined with N tunable lasers, N modulators and N optical receivers. Each of the N tunable lasers can selectively produce N different wavelengths. The coupler couples ... | 04/15/2003 |
| 6542655 | N×N crossconnect switch using wavelength routers and space switches An N×N crossconnect switch, for large N, is implemented using an arrangement of smaller wavelength routers combined with space switches. An N×N crossconnect switch is constructed in three stages, using a plurality of input space switches, a plurality of... | 04/01/2003 |
| 6535313 | Dynamically assignable optical signal access control apparatus An optical signal access apparatus responds to variations in network traffic by dynamically assigning the number of wavelengths at originating and terminating optical signal access apparatus. A controller of an optical signal access apparatus monitors net... | 03/18/2003 |
| 6532090 | Wavelength selective cross-connect with reduced complexity A wavelength division multiplex (WDM) cross-connect architecture that can selectively cross-connect, at a wavelength granularity, wavelength channels from any of a plurality of input WDM optical facilities (e.g., fibers) to any of a plurality of output WD... | 03/11/2003 |
| 6512612 | Intelligent optical router An optical router includes a capacity utilization unit which determines a packet capacity utilization level of each of a plurality of wavelengths being received at the optical router and a packet combiner unit which combines packets from the two or more w... | 01/28/2003 |
| 6485996 | Method of making wafer having top and bottom emitting vertical-cavity lasers A technique is described for determining the performance of substrate-side emitting VCSELs formed on a wafer. The technique involves forming top-emitting VCSELs on the same wafer as bottom-emitting VCSELs and then testing the top-emitting VCSELs and using... | 11/26/2002 |
| 6463197 | Coupling of optical signals to misaligned waveguides on different wafers An imaging arrangement technique is used to align a first waveguide on a first wafer to a second waveguide on a second wafer. The adaptive imaging arrangement is used on both the first and second waveguides when the first and second wafers are orthogonal ... | 10/08/2002 |
| 6459826 | Programmable optical switch apparatus An optical switch comprises a programmable optical polarization unit (POLCON) which receives an input optical signal and selects an output signal polarization in response to a control signal. A polarization beam splitter (PBS) splits the selected polariza... | 10/01/2002 |
| 6400860 | Wavelength selective polarization beam splitter/combiner A wavelength selective polarization beam device uses waveguide grating routers (WGRs) having birefringent grating waveguides. When the device is used as a splitter it separates different wavelength channels of a wavelength division multiplexed (WDM) signa... | 06/04/2002 |
| 6396611 | Modular optical network units and mounting arrangement A common Modular Carrier (MC) unit shares power and control among a plurality of Optical Network Units (ONU) which are plugged into it, thereby increasing the ONU density in an existing equipment shelf. In one embodiment, the MC unit together with its fou... | 05/28/2002 |
| 6396977 | Wavelength router with a wide passband realized using two gratings of opposite angular dispersions The passband of an optical wavelength router is widened by using a combination of two grating apparatuses with opposite angular dispersions. The passband width approaches the channel spacing, with minimal loss penalty. This technique is particularly attra... | 05/28/2002 |
| 6392769 | Automatic level control circuit for optical system Feedback instabilities arising from interactions between automatic control loops at the amplifier nodes of an optical network are eliminated by restricting operation to a single amplifier node at a time. Amplifier node activation is accomplished using a g... | 05/21/2002 |
| 6393039 | Double-pass polarization diversified birefringent filter A double-pass birefringent filter apparatus comprises an external-interface apparatus (illustratively including of a beam-displacer element and a waveplate element); a birefringent filter comprised of a series of several birefringent waveplates; and a wra... | 05/21/2002 |
| 6381048 | Wavelength division multiplexed system having reduced cross-phase modulation Resonances in cross-phase-modulation (CPM) impairment occur in wavelength-division-multiplexed (WDM) transmission systems, having multiple equal dispersion-length amplifier spans, when channels have an integral number of bit walk-throughs per amplifier sp... | 04/30/2002 |
| 6359912 | Multiple wavelength laser having a reduced number of wavelength controls An integrated, single output port, tunable multiple wavelength laser apparatus produces one of Na Nb wavelengths using only Na plus Nb selection signals. Each of Nb ports can output Na of t... | 03/19/2002 |
| 6330104 | Optical wavelength conversion using four wave mixing in fiber A wavelength conversion apparatus and method uses four wave mixing of a first wavelength and a control wavelength in an optical fiber to convert the first wavelength to a desired wavelength. Four wave mixing is produced by operating the optical fiber at a... | 12/11/2001 |
| 6304350 | Temperature compensated multi-channel, wavelength-division-multiplexed passive optical network Temperature compensation of a wavelength-division-multiplexed (WDM) passive optical network (PON) communication system uses power measurements from each of it remote nodes (RNs) to adjust the frequency of an associated multifrequency laser (MFL). Changes ... | 10/16/2001 |
| 6285022 | Front accessible optical beam switch An optical beam switch is designed for improved serviceability by mounting two fiber optic beam deflection arrays to face the front of a rack assembly. Inside the optical beam switch, a reflecting device is located behind each of the two fiber optic beam ... | 09/04/2001 |
| 6275313 | Raman gain tilt equalization in optical fiber communication systems The spectral distortion introduced by stimulated Raman scattering (SRS) in an optical fiber transmission system has been determined to always be linear on a dB/nm scale and depend solely on the total input power and not on the input power distribution. By... | 08/14/2001 |
| 6271950 | Optical differential phase shift keying transmission system having multiplexing, routing and add/replace capabilities A Differential Phase Shift Keying (DPSK) optical transmission system provides time division multiplexing, channel routing and channel add/replace functions. The DPSK transmitter comprises a laser to generate an optical carrier signal; a delay encoder to p... | 08/07/2001 |
| 6263127 | Free-space/arrayed-waveguide router A router combines free-space and guided wave optics to drastically increase the number of channels used in WDM transmission systems. The two-stage router uses the partial demultiplexing characteristic of an arrayed waveguide router (AWR) combined with a f... | 07/17/2001 |
| 6252711 | Polarization diversity for birefingent filters A birefringent filter includes an input optical apparatus for receiving an input optical beam and producing therefrom parallel first and second optical beams offset in a first direction and having the same polarization. A birefringent filter unit receives... | 06/26/2001 |
| 6246667 | Backwards-compatible failure restoration in bidirectional multiplex section-switched ring transmission systems A restoration procedure for use in bidirectional multiplex section-switched ring transmission systems re-establishes a connection path by using a loopback connection at nodes bordering the failure and by then establishing a jumpered connection path, for e... | 06/12/2001 |
| 6240118 | Multichannel laser transmitter with a single output port A multichannel laser is based on an interleaved chirped waveguide grating router. An interferometric modulator is incorporated inside a laser cavity by means of a waveguide grating router and enables independent modulation of any of the wavelengths of the... | 05/29/2001 |
| 6240109 | Wavelength stabilization of wavelength division multiplexed channels Laser wavelengths used in a WDM system are stabilized using a known accurate electrical frequency standard. The laser wavelengths are stabilized using a first frequency locking circuit which individually locks each laser wavelength to a different resonant... | 05/29/2001 |
| 6222966 | Adiabatic Y-branch waveguide having controllable chirp Changing the index in the two output branches of a Y-branch optical waveguide in opposite directions, in amounts which are controlled by electrical signals applied to the branches, is used to control the chirp of the signal outputted from the Y-branch opt... | 04/24/2001 |
| 6222206 | Wafer having top and bottom emitting vertical-cavity lasers A technique is described for determining the performance of substrate-side emitting VCSELs formed on a wafer. The technique involves forming top-emitting VCSELs on the same wafer as bottom-emitting VCSELs and then testing the top-emitting VCSELs and using... | 04/24/2001 |
| 6212315 | Channel power equalizer for a wavelength division multiplexed system A dynamically and chromatically variable transmissivity apparatus (e.g., a channel equalizer or an add-drop circuit) controls channel powers in wavelength-division multiplexed systems. The input WDM signal is split into two components, in one component a ... | 04/03/2001 |
| 6204942 | Demultiplexing with clocked optical receivers An optical demultiplexer demultiplexes an N channel multiplexed optical data signal, at a first data rate, into N signal data channels. The demultiplexing is provided by N optical receivers, each receiver receiving a clock signal and the multiplexed optic... | 03/20/2001 |
| 6177861 | System for short range wireless data communication to inexpensive endpoints A system provides short range wireless data communication from a central control point (e.g., interrogator) to inexpensive endpoints (e.g., tags). The endpoints utilize the technology of modulated backscatter for transmission from the tags to the interrog... | 01/23/2001 |
| 6175438 | Differential optical signal receiver A differential optical signal receiver includes an interference-rejecting circuit to provide enhanced interference signal rejection. The differential optical signal receiver includes a differential optical signal detector for detecting a received differen... | 01/16/2001 |
| 6163569 | Split-architecture modem A split-architecture modem splits the physical layer protocol into a logical operations portion and a signal processing portion. A first processor (e.g., a general purpose processor (GPP)) of the modem performs the logical operations of the physical layer... | 12/19/2000 |
| 6157757 | Polymer fiber optical transmission system We have determined that unlike the most multimode silica fiber, multimode polymer fiber often exhibits a delay characteristic that has a broad low dispersion region where propagation delay of spatially restricted optical pulses remains relatively constant... | 12/05/2000 |
| 6147788 | Guiding filters for wavelength division multiplexing in soliton transmission In soliton transmission, third order dispersion of the transmission fibers tends to cause unacceptable variation in the filter strength parameter, η over the wide wavelength bands required for massive wavelength division multiplexing (WDM). The effect of... | 11/14/2000 |
| 6134250 | Wavelength-selectable fiber ring laser A stable single-mode wavelength selectable ring laser operates at a single wavelength which is selectable from any channel passband of a multiple-channel wavelength multiplex/demultiplexer element (e.g., an arrayed waveguide grating router (AWGR)). A Fabr... | 10/17/2000 |
| 6108469 | Wavelength selective resonant gratings A wavelength selective resonant grating exhibits transmission resonances when a single gap between two sections of a split gratings is used to provide a phase shift which is not a quarter wavelength in length or π/2 in phase. When the phase is changed to... | 08/22/2000 |
